CN207554023U - Hydrate recovery well cased hole gravel packing analogue system - Google Patents

Abstract

The utility model discloses a kind of hydrate recovery well cased hole gravel packing analogue system, including test well subsystem, simulation filling subsystem and filling quality detection subsystem；Shaft column is installed according to practical casing programme,Carry out packing job emulation and filling quality detection,It not only can be to practical exploitation of gas hydrates well reservoir characteristics,Cased hole gravel packing operation under casing programme limitation carries out full-scale emulation,It can also be to the construction quality of packing job,Packing job adaptability under long-term Hydrate Formation Conditions carries out monitored over time and evaluation,So as to achieve the purpose that Optimizing construction parameter and process design parameter,With reference to radial flow current divider,The introducing of pinpoint pressure meter and acoustic imaging logging system,Make measurement effect true and reliable,Simulation result is constructed closer to difference,The property of can refer to is strong,It is emulated suitable for the cased hole gravel packing process and its effect monitoring of different casing programmes,It is not only that ocean shallow layer gas hydrate recovery well gravel packing operations Adaptability Evaluation provides new thinking,Foundation can also be provided for the best arrangement and method for construction and optimal processing parameter of gravel packing operations.

Description

Hydrate recovery well cased hole gravel packing analogue system

Technical field

It, can be into more particularly to one kind the utility model is related to ocean gas hydrate development of resources field of engineering technology The integrated simulation system of gravel-packing process emulation and its effect assessment in row hydrate production tubing.

Background technology

Natural gas hydrate resources are the unconventional gas resources that a kind of distribution is wide, energy resource density is high, and natural gas is hydrated Object is the strategic high ground of future global energy development, and the U.S., Japan, Germany, India, Canada, South Korea have successively worked out day Right gas hydrate research and development plan.Successful pilot production of the China at the South Sea is undoubtedly opens in the exploration of global natural gas hydrate resources It is walked in the competition of hair in the forefront in the world.China has accelerated to promote gas hydrates industrialization exploitation paces at present, strives Advantage is occupied in the gas hydrates competition of the Qu worlds.

In general, buried depth of natural gas hydrate resources reservoir itself is shallow, cementing difference, decomposition of hydrate effect leads to stratum Cementing strength further reduces, and original weak consolidation reservoir is possibly even fully converted to quicksand formation, therefore gas hydrates Recovery process inevitably shakes out, in order to maintain continuing for production, it is impossible to fully according to conventional gas oil row The viewpoint of industry sand control carries out reservoir sand stringent blocking.For the shale flour sand natural gas reservoirs of China South Sea, sand control side Formula must assure that a large amount of shale particle in stratum can smoothly be expelled to pit shaft first, and the shale fine grained for being discharged into pit shaft passes through well The mode of cylinder fluid infusion is carried to well head, and therefore, down-hole sand control medium is to connect formation sand production and the bridge of sand-carrying production process.By This as it can be seen that sand control medium construction operation process simulation research and construction operation effect assessment for practical exploitation of gas hydrates Well sand control treatment detail design is most important.

Gravel filling is typical down-hole sand control means, mainly includes cased hole gravel packing and outside casing gravel packing.Japan 2013 gas hydrates pilot production projects of Nankai Trough use bore hole outside casing gravel packing operation, achieve pilot production 6d, The pilot production achievement of 120000 sides.But bore hole outside casing gravel packing it is maximum the problem of be：In prime stratum, hydrate is as cementing Object exists, and occupies very big volumetric spaces.With the decomposition of hydrate, originally there is the volume that hydrate occupies that can gradually appear thanks to Sky, this deficit is from open hole wall gradually to stratum internal stretch.Again under the conditions of this, the pack gravel with open hole wall joint Certain wriggling and infall process can occur for layer, with continuing for infall process, can occur big on the top on filling section stratum Filling is in debt, and sand control screen is caused to be directly exposed to air-liquid, in the sand flowing space, screen cutting will soon occur, cause to prevent Sand fails.In conclusion how to prevent the wriggling of gravel pack particle is the key that one of to solve the above problems, gravel in middle pipe Stone filling, restraining liner or the cementing screen casing of coated sand are one of means for solving gravel wriggling sedimentation (by taking Geoform as an example).

But there has been no the examples being applied successfully in gas hydrates test mining project, only preliminary filling for current cased hole gravel packing It fills out screen casing or the cementing screen casing of coated sand has obtained part pilot production verification.Compared with conventional gas and oil reservoir, gas hydrates reservoir A typical feature be that buried depth is shallow, formation fracture pressure is extremely low, and gravel packing operations are necessarily faced with conventional Deep Oil And Gas Exploration not Same challenge.The final using effect of gravel packing operations depends on two major class key number of technological parameter and construction operation parameter According in order to verify the adaptability of cased hole gravel packing construction operation during exploitation of gas hydrates, it is necessary to carry out big ruler Cased hole gravel packing process simulation is spent, and verifies gravel filling effect (containing construction quality and for a long time by certain laboratory facilities Two aspect of control sand effect under working condition), so as to be chosen for sternness existing for solution marine site shallow layer gas sand management aspect War provides support.

For this purpose, the exploitation demand to meet China's aleuritic texture reservoir natural gas hydrate resources, is China marine site natural gas Hydrate test mining project sand management provides certain support, it would be highly desirable to which cased hole gravel packing sand control treatment can be carried out by providing one kind The analogue system of Construction Simulation.

Utility model content

The technical problem to be solved by the utility model is to be directed to current exploitation of gas hydrates to shake out to pit shaft control The active demand of system proposes a kind of hydrate recovery well cased hole gravel packing analogue system, can carry out gravel in full-scale pipe Packing job process simulation and its effect monitoring are commented for ocean shallow layer gas hydrate recovery well gravel packing operations adaptability Valency provides new approaches, and can provide foundation for the best arrangement and method for construction and optimal processing parameter of gravel packing operations.

The utility model is realized using following technical solution：

A kind of hydrate recovery well cased hole gravel packing analogue system is 1 with practical gravel pack tools:1 correspondence, Meet full-scale gravel pack tools tripping in and gas hydrates depth of reservoirs condition, analog result reliability is high, engineering is real Trampling property is strong, including test well subsystem, simulation filling subsystem and filling quality detection subsystem；

The test well subsystem includes simulation wellbore hole, analog casing, simulation oil pipe, three-phase injection pipeline and mechanical picker It manages, blowout preventer flashboard is provided at the well head of simulation wellbore hole；Three-phase filling line interface, gas are installed on blowout preventer flashboard Output pipe interface, water sand output/filling line interface and slurry return out pipe interface, and each pipe interface be equipped with it is corresponding Gate valve；Analog casing is arranged in simulation wellbore hole, and the annular space between simulation wellbore hole and analog casing is additionally provided with oil pipe and passes through envelope Every device, have the function of that oil pipe passes through, and three-phase injects pipeline and passes through packer across the oil pipe and be fixed at simulation well The radial flow current divider of cylinder bottom is connected；Simulation oil pipe and mechanical screen casing are arranged in analog casing；Simulate oil pipe and mechanical picker Pipe is connected and positioned at the top of mechanical screen casing, and is preset with mould according to real well bottom perforating parameter in the pay interval of analog casing Intend preforation tunnel, analogue perforation eyelet segment length is consistent with mechanical picker length of tube；Annular space between analog casing and simulation oil pipe Oil jacket annular packer is installed, oil jacket annular packer is located at the top of analogue perforation eyelet；The outer protective cover of mechanical screen casing The space formed between analog casing inner wall, oil jacket annular packer and shaft bottom is gravel pack space in pipe；In gravel Stowing operation simulation stage, three-phase injection pipeline pass through that packer injects gas and water into well, silt particle three is mixed across oil pipe Object monitors the stage in filling effect, and the valve of three-phase injection pipeline is closed；

The simulation filling subsystem includes the filling pipe string combination being arranged in simulation wellbore hole and setting on the ground Gas cylinder group, water tank, gravel mulling case, three-phase mixer and slurry recycling can, filling pipe string combination include filling piping, Packer and filling nozzle are filled, filling piping is arranged in simulation oil pipe, and filling nozzle is arranged on the lower end of filling piping, fills It fills out packer to be mounted between the filling top of nozzle and mechanical picker inside pipe wall, gravel mulling case is gravel-packing process emulation Critical component including gravel, load fluid mixing agitator and injection pump, is connected with water sand output/filling line interface, practical gravel In the emulation of stone stowing operation, by sand in gravel mulling case than the control with pumpage, pump discharge pressure, it can be achieved that different constructions The purpose that stowing operation emulates in the case of parameter；The arrival end of the gas cylinder group passes through pipeline and oil jacket annular space gas output Circuit is connected, and the port of export of gas cylinder group is connected by pipeline with the arrival end of three-phase mixer, the oil jacket annular space gas Analog casing is in output circuit and simulates the annular space that is formed between oil pipe, for three-phase mixer make-up gas and recycling by well Bottom detaches the gas of output；The arrival end of the water tank is connected by pipeline with the lifting tubing string in simulation oil pipe, and water tank goes out Mouth end is connected by pipeline with the arrival end of three-phase mixer, for make-up water, silt particle mixed liquor into three-phase mixer and is returned Water, the silt particle mixture from shaft bottom output are received, gas and water increment is consistent with practical gas hydrates reservoir output gas-water ratio； Three-phase mixer includes air-water-silt particle mixing agitator and three-phase injection pump, and to seal high-pressure installation, three-phase mixer goes out Mouth end is connected by pipeline with three-phase filling line interface, can realize the real-time mixing and injection of three-phase, practical gravel In filling effect simulation process, by controlling the discharge capacity of three-phase injection pump and silt particle ratio, grain size, shake out situation to simulate difference It goes into the well the situation of change of basal conglomerate filling layer；The slurry recycling can returns out annular space with sand-carrying production liquid by pipeline and connect, institute It states sand-carrying production liquid to return out annular space as filling piping and simulate the annular space between oil pipe, setting load fluid filters in slurry recycling can Device realizes the filtering and storage of compaction fluid；

The filling quality detection subsystem includes gas separator, lifting tubing string and pinpoint pressure meter and acoustic imaging Logging system；Gas separator only uses in gravel filling effect emulates monitoring process, and gas separator and lifting tubing string are equal It is arranged in simulation oil pipe, and the outlet of gas separator and oil jacket annular space gas output circuit communication, with practical gas water Conjunction object recovery well is consistent, and the main function of gas separator is detached from the gas and water of reservoir output, silt particle three-phase mixed flow body Gas, water, silt particle mixture after detaching then give rise to ground by simulating the lifting tubing string inside oil pipe；The fixed point pressure Power meter is included mounted on the pinpoint pressure meter P3 and pinpoint pressure meter P2 of mechanical picker inside pipe wall upper/lower terminal and mounted on mould Manage the pinpoint pressure meter P4 and pinpoint pressure meter P1 of outer upper/lower terminal in the filling position for intending casing；Filling quality detection System is acoustic imaging logging system under conventional well, the gray value of the outer filling layer of screen casing can be measured, according to the continuous of gray value Property and size absolute value judge cased hole gravel packing construction whether succeed.

Further, impeller guide piece is provided at the interior inlet of the radial flow current divider, impeller guide piece is set Meter can make in the air-liquid of injection, the annular space of silt particle churning to radial flow current divider, make simulation closer to practical pit shaft Flox condition.

Further, the annular porous plate of lower end linking of the impeller guide piece, annular porous plate are located at radial direction current divider Between inner and outer wall, it is sufficiently mixed gas-liquid by annular porous plate.

Further, outer small interior big wedged hole is provided on the radial direction current divider inner wall, ensures three-phase mixed flow body The access wall bottom in a manner of radial flow.

Further, the simulation wellbore hole meets full-scale gravel pack tools tripping in and gas hydrates depth of reservoirs Condition, depth 200m, analog result reliability and engineering practice are strong.

Further, setting load fluid filter device in the slurry recycling can, realizes the filtering of compaction fluid with depositing It puts.

Further, the blowout preventer flashboard is the bridge between joint test well subsystem, simulation filling subsystem, Be test well maintain high-pressure system critical piece, pressure-resistant 15Mpa.

Compared with prior art, it is the advantages of the utility model with good effect：

Test well subsystem, simulation filling subsystem and filling quality detection subsystem described in this programme are full-scale Parameters simulation, test well depth bounds can cover the basic depth bounds of current China's ocean gas hydrate reservoir, imitate True result is constructed closer to difference, and the emulation property of can refer to is strong；And the inlet design impeller guide piece of radial flow current divider, energy Enough enable in the air-liquid of injection, the annular space of silt particle churning to radial flow current divider, with reference to interior annular porous plate and The design of wedged hole on inner wall, ensures three-phase mixed flow body access wall bottom in a manner of radial flow, and simulation process is closer practical The Radial Flow process of stratum production process, and prevent accumulated plugging of the silt particle on porous plate；

In addition, respectively installing pinpoint pressure meter in mechanical picker inside pipe wall, analog casing outer wall upper and lower end respectively, detect in real time Pressure measurement parameter in filling simulation stage, can ensure that bottom pressure is less than day in filling simulation process by real-time data transmission The fracture pressure on right gas hydrate stratum, achievees the purpose that Optimizing construction parameter；The stage is monitored in gravel filling effect, it can be right The blocking of gravel layer or creeping deformation process are described in real time during simulated production, judge that gravel fills the term of validity, excellent Change the Gravel packing of gravel packing zone, the acoustic imaging logging system of scene actual use separately is introduced into gravel filling effect surveys Amount, measurement effect are true and reliable；

It is 1 by the construction parameter result that simulation optimization obtains and site operation parameter:1 correspondence, simulation result can To be directly used in shallow layer gas hydrate reservoir gravel pack service, and detection gravel pack service can be synchronized by emulation The blocking process that gravel layer may occur under the conditions of itself quality and long-term production, and can be adjusted and managed according to actual conditions Interior pipe string combination is emulated suitable for gravel-packing process in the diameter tube of different casing programmes and its effect monitoring.

Description of the drawings

Fig. 1 is analogue system stowing operation structure diagram in the utility model embodiment 1；

Fig. 2 is analogue system filling effect monitoring process structure diagram in the utility model embodiment 1；

Fig. 3 is radial direction current divider schematic diagram described in the utility model embodiment 1；

Fig. 4 is the cross-sectional structure schematic diagram of radial direction current divider inner wall described in Fig. 3；

Fig. 5 is emulation mode flow diagram described in the utility model embodiment 2；

Wherein, 1, simulation wellbore hole；2nd, analog casing；3rd, oil pipe is simulated；4th, radial flow current divider；5th, blowout preventer flashboard； 6th, gas cylinder group；7th, gas separator；8th, three-phase injection pipeline；9th, three-phase mixer；10th, water tank；11st, oil pipe passes through packing Device；12nd, oil jacket annular packer；13rd, packer is filled；14th, nozzle is filled；15th, gravel mulling case；16th, slurry recycling can； 17th, gravel packing zone；18th, mechanical screen casing；19th, analogue perforation eyelet；20th, filling piping；21st, radial direction current divider outer wall；22nd, diameter To current divider inner wall；23rd, wedged hole；24th, impeller guide piece；25th, annular porous plate；F1-F7：High pressure valve；P1-P4：Fixed point Pressure gauge.

Specific embodiment

In order to which the above-mentioned purpose of the utility model, feature and advantage are more clearly understood, below in conjunction with the accompanying drawings and Embodiment is described further the utility model.It should be noted that in the absence of conflict, embodiments herein and Feature in embodiment can be combined with each other.

Embodiment 1, a kind of hydrate recovery well cased hole gravel packing analogue system are 1 with practical gravel pack tools:1 Correspondence meets full-scale gravel pack tools tripping in and gas hydrates depth of reservoirs condition, analog result reliability Height, engineering practice are strong, including test well subsystem, simulation filling subsystem and filling quality detection subsystem.

With reference to figure 1, the test well subsystem includes simulation wellbore hole 1, analog casing 2, simulation oil pipe 3, three-phase ascending pipe Line 8 and mechanical screen casing 18 are provided with blowout preventer flashboard 5 at the well head of simulation wellbore hole 1；The depth of simulation wellbore hole be 200m, well Mouth blowout prevention flashboard is the bridge between joint test well subsystem, simulation filling subsystem, is that test well maintains high-pressure system Critical piece, pressure-resistant 15Mpa, installation three-phase filling line interface, gas output pipe interface, water sand on blowout preventer flashboard 5 Output/filling line interface and slurry return out pipe interface, and each pipe interface be equipped with corresponding gate valve (F2, F4, F3, F7), the gate valve is high-pressure ball valve；Analog casing 2 is arranged in simulation wellbore hole 1, between simulation wellbore hole 1 and analog casing 2 Annular space is additionally provided with oil pipe and passes through packer 11, has the function of that oil pipe passes through, and three-phase injection pipeline 8 is passed through across the oil pipe Packer 11 is connected with being fixed at the radial flow current divider 4 of 1 bottom of simulation wellbore hole, as shown in figure 3, radial flow current divider 4 Impeller guide piece 24, the annular porous plate 25 of 24 lower end of impeller guide piece linking, annular porous plate 25 are provided at interior inlet Between radial direction current divider inner wall 22 and outer wall 21, it is sufficiently mixed gas-liquid；With reference to figure 4, set on the inner wall 22 of radial direction current divider Outer small interior big wedged hole 23 is equipped with, the design of impeller guide piece 24 can make the air-liquid of injection, silt particle churning to radial direction flow point In the annular space for flowing device, with reference to the design of its interior annular porous plate 25 and inner wall wedged hole 23, ensure three-phase mixed flow Body access wall bottom in a manner of radial flow makes simulation closer to the flox condition of practical pit shaft；And silt particle can be prevented porous Accumulated plugging on plate can adjust emulation pipe string combination according to the casing programme of practical exploitation of gas hydrates well, pass through well Bottom radial flow current divider realizes injection conversion of the mixture from single flow direction radial flow.

Simulation oil pipe 3 and mechanical screen casing 18 are arranged in analog casing 2；Simulation oil pipe 3 is connected with mechanical screen casing 18 and position In the top of mechanical screen casing 18, simulation oil pipe 3 and mechanical screen casing 18 can be according to the wells of practical gas hydrates pilot production well Deep structure is adjusted, screen casing sample of the mechanical screen casing 18 used in practical gas hydrates pilot production well；In addition it is covered in simulation The pay interval of pipe 2 is preset with analogue perforation eyelet 19, analogue perforation hole section according to real well bottom perforating parameter (aperture, Kong Mi) Length it is consistent with mechanical 18 length of screen casing；Annular space between analog casing 2 and simulation oil pipe 3 is equipped with oil jacket annular packer 12, oil jacket annular packer 12 is located at the top of analogue perforation eyelet 19 (i.e. in simulation oil pipe 3 and the connecting portion of mechanical screen casing 18 At position)；It is formed between 2 inner wall of outer protective cover and analog casing of mechanical screen casing 18, oil jacket annular packer 12 and shaft bottom Space is gravel pack space in pipe, and it is filled with gravel packing zones 17；In gravel-packing process simulation stage, three-phase injection Pipeline 8 passes through packer 11 across oil pipe and gas and water, silt particle three-phase mixture is injected into well, filling effect monitor the stage, three Mutually the valve (F2) of injection pipeline 8 is closed.

In addition, with continued reference to Fig. 1 and Fig. 2, the simulation filling subsystem includes the filling pipe being arranged in simulation wellbore hole 1 Gas cylinder group 6, water tank 10, gravel mulling case 15, three-phase mixer 9 and the slurry recycling of column combination and setting on the ground Tank 16, filling pipe string combination include filling piping 20, filling packer 13 and filling nozzle 14, filling piping 20 and are arranged on simulation In oil pipe 3, filling nozzle 14 is arranged on the lower end of filling piping 20, and filling nozzle 14 can be gravel in different types of downhole tubular Stone packing tool, filling packer 13 are mounted between 18 inner wall of top and mechanical screen casing of filling nozzle 14, fill packer 13 main function is：Fluid circuit is formed in emulation gravel-packing process, fluid carries gravel and is filled to above-mentioned gravel pack Space, liquid are then returned in the annular space that filling tubing string and simulation oil pipe are formed by mechanical screen casing and discharge ground；Gravel Stone mulling case 15 is the critical component of gravel-packing process emulation, including gravel, load fluid mixing agitator and injection pump, with water Sand output/filling line interface is connected, and in practical gravel-packing process emulation, is arranged by sand ratio in gravel mulling case 15 and pump The control of amount, pump discharge pressure is, it can be achieved that the purpose that stowing operation emulates in the case of different construction parameters；The gas cylinder group 6 arrival end is connected by pipeline with oil jacket annular space gas output circuit, and the port of export of gas cylinder group 6 passes through pipeline and three-phase The arrival end of mixer is connected, and analog casing 2 is in the oil jacket annular space gas output circuit and simulates the ring formed between oil pipe 3 Sky, for 9 make-up gas of three-phase mixer and recycle by shaft bottom separation output gas；The arrival end of the water tank 10 passes through Pipeline is connected with the lifting tubing string in simulation oil pipe 3, the arrival end phase that the port of export of water tank 10 passes through pipeline and three-phase mixer 9 Even, for water, the silt particle mixture of make-up water, silt particle mixed liquor and recycling from shaft bottom output, gas and water into three-phase mixer 9 Increment is consistent with practical gas hydrates reservoir output gas-water ratio；Three-phase mixer 9 includes air-water-silt particle and is mixed Device and three-phase injection pump, to seal high-pressure installation, the port of export of three-phase mixer 9 passes through pipeline and three-phase filling line interface phase Even, it can realize the real-time mixing of three-phase and inject, in practical gravel filling effect simulation process, by the way that three-phase is controlled to note Enter the discharge capacity of pump and silt particle ratio, grain size, to simulate the situation of change of shaft bottom gravel packing zone in the case of difference is shaked out；The slag Slurry recycling can 16 returns out annular space with sand-carrying production liquid by pipeline and connect, and the sand-carrying production liquid returns out annular space as filling piping 20 With the annular space between simulation oil pipe 3, setting load fluid filter device in slurry recycling can 16, realize the filtering of compaction fluid with Storage.

Filling quality detection subsystem include gas separator 7, lifting tubing string and pinpoint pressure meter and sound wave into As logging system；As shown in Fig. 2, gas separator 7 only uses in gravel filling effect emulates monitoring process, gas separator 7 are arranged at lifting tubing string in simulation oil pipe 3, and the outlet (being located on oil jacket annular packer 12) of gas separator 7 With oil jacket annular space gas output circuit communication, the main function of gas separator 7 consistent with practical exploitation of gas hydrates well It is to detach gas from the gas and water of reservoir output, silt particle three-phase mixed flow body, the water, silt particle mixture after detaching then pass through Lifting tubing string inside simulation oil pipe gives rise to ground；The pinpoint pressure meter includes upper and lower mounted on 18 inner wall of mechanical screen casing The pinpoint pressure meter P3 and pinpoint pressure meter P2 at both ends and the outer upper/lower terminal of pipe at the filling position of analog casing 2 Pinpoint pressure meter P4 and pinpoint pressure meter P1；The filling quality detection subsystem is acoustic imaging well logging system under conventional well System can measure the gray value of the outer filling layer of screen casing, judge that gravel fills in pipe according to the continuity of gray value and size absolute value Fill out whether construction succeeds.

Analogue system described in the present embodiment is full-scale parameters simulation, and test well depth bounds can cover current China The basic depth bounds of ocean gas hydrate reservoir, simulation result are constructed closer to difference, and the emulation property of can refer to is strong；And The inlet design impeller guide piece of radial flow current divider, can enable the air-liquid of injection, silt particle churning to radial flow shunt In the annular space of device, with reference to the design of inside porous plate and wedged hole, simulation process is closer to actual formation production process Radial Flow process；In addition, by respectively installing pinpoint pressure in mechanical picker inside pipe wall, analog casing outer wall upper and lower end respectively Meter detects pressure measurement parameter in real time, in filling simulation stage, can ensure well in filling simulation process by real-time data transmission Bottom pressure is less than the fracture pressure of natural gas hydrate stratum, achievees the purpose that Optimizing construction parameter；It is supervised in gravel filling effect The survey stage can describe the blocking of gravel layer during simulated production or creeping deformation process in real time, judge gravel The term of validity is filled, optimizes the Gravel packing of gravel packing zone, separately the acoustic imaging logging system by scene actual use is introduced into Gravel filling effect measures, and ensures that measurement effect is true and reliable.

Embodiment 2, based on analogue system described in embodiment 1, in addition the present embodiment also proposes a kind of hydrate recovery well Cased hole gravel packing emulation mode with reference to figure 5, includes the following steps：

A, shaft column is installed according to practical casing programme, checks the leakproofness of each sealing station, retrofilling simulation subsystem It unites and carries out packing job emulation；

B, retrofilling quality testing subsystem monitoring filling quality, and judge whether filling quality is qualified, if unqualified, Re-start packing job emulation；If qualified, mixed injection air-liquid, silt particle simulation production process, and feelings of shaking out are monitored in real time Condition；

C, judge whether control sand effect is qualified, if control sand effect is unqualified, adjusts filling process parameter, re-starts and fill Fill out operation simulation；If it is qualified to control sand effect, best filling process parameter and filling construction parameter are obtained, completes emulation；

The filling construction parameter includes the sand ratio, pumpage, pump discharge pressure, the load fluid that are controlled by gravel mulling case Type and its associated fluid mechanics parameter；The filling process parameter includes the grain size of pack gravel layer, filling layer thickness, gravel Type (haydite, quartz sand, walnut shell etc.) etc. and its intercombination.

For example, it is introduced by taking the basic formation fracture pressure of China South Sea gas hydrates as an example, with practical natural Gas hydrate reservoir sand size distribution and shale component are basic simulation medium, select respectively -70 mesh of 40 mesh quartz sand, 30 The quartz sand of -100 mesh of quartz sand and 70 mesh of -50 mesh of mesh emulates and carries out filling effect monitoring, is as follows：

(1) connecting line between simulation filling subsystem and blowout preventer flashboard is disconnected, pressure is injected into well 15MPa, between the sealing, blowout preventer flashboard 5 and three-phase injection pipeline 8 between verification blowout preventer flashboard 5 and simulation wellbore hole 1 Sealing, the sealing between blowout preventer flashboard 5 and filling filling line 20, between blowout preventer flashboard 5 and analog casing 2 Sealing between sealing and blowout preventer flashboard 5 and simulation oil pipe 3；

(2) it is calculated by simulating, obtaining China South Sea gas hydrates reservoir formation fracture pressure gradient is 1.1ppg, therefore it is containing the lightweight load fluid for scraping glue additive to select load fluid, the quartz of -70 mesh of 40 mesh is selected in emulation for the first time Sand；

(3) intend the production tubing column combination used according to China South Sea gas hydrates, the size of analog casing 2 is 131/2 ", the size for simulating oil pipe 3 and mechanical screen casing 18 is 83/4 ", pay thickness 26m, mechanical screen joint size 9m, altogether Count 3, tripping in screen casing；The ideal filling layer position thickness of gravel packing zone 17 is 27m, radially fills layer thickness as in analog casing The difference of diameter and mechanical picker pipe outside diameter；Pinpoint pressure meter P4, P1 are installed respectively close to payzone upper and lower end in 2 outside of analog casing, under Enter analog casing 2 and oil pipe passes through packer 11 and setting；It installs and determines respectively close to payzone upper and lower side in mechanical 18 inner wall of screen casing Point pressure meter P3, P2 connect mechanical screen casing 18 and simulation oil pipe 3, the above-mentioned pipe string combination of tripping in and oil jacket annular packer 12, seat Envelope；

(4) tripping in gravel filling piping 20 and filling nozzle 14, setting filling packer 13, are closed and blowout preventer flashboard 5 valve F2, F4 being connected connect valve F3, F7, connect gravel mulling case 15 and slurry recycling can 16 respectively, set gravel Sand ratio in mulling case is 20%, pumpage 10m³/h；

(5) start the injection pump in gravel mulling case 15, flow pack fills tubing string and simulates the load fluid between oil pipe It flows into slurry tank 16 and treats subsequent processing.The pumpage of acquisition injection in real time, pressure, sand are than data and shaft bottom pinpoint pressure meter P1, P4 Passback pressure data, ensure that P1 is less than the formation fracture pressure that is calculated according to stratum fracture pressure gradient；Stowing operation In if observation pump pressure situation of change, if P1 persistently rises, reduce pumpage, conversely, then slightly improving pumpage；In real time Filling pump pump pressure in gravel mulling case 15 is observed, if discharge capacity is pumped raising suddenly in the case of persistently reducing, shows sand off, It is transferred to step (6)；

(6) stop filling emulation, deblocking filling packer 13 acts gravel filling tubing string 20 and filling nozzle 14, tripping in Filling quality detects subsystem to artificial bottom of a well, then slowly above carries, upward strain speed and Conventional sound imaging logging upward strain speed Unanimously, test fills the acoustic imaging data of interval and does inversion procedure during above carrying, if the measurement of acoustic imaging system Grey value profile is uniform, and gray scale is stronger, illustrates to fill compaction rate height, filling uniformly, filling quality is qualified.Conversely, solution oil sealing Annular packer 12 is covered, by 8 injected clear water of three-phase filling line or load fluid, goes out gravel packing zone 17, return to step (4), sand ratio or pumpage are adjusted, is refilled, until filling quality qualification, the combination of gained construction parameter is practical day Best gravel pack service parameter combination needed for right gas hydrate recovery well；

(7) it rises and filling quality detection subsystem, tripping in gas separator 7 and wellbore lift tubing string, dismantle gravel mulling Case 15 and slurry recycling can 16, installation gas cylinder group 6, water tank 10 and three-phase mixer 9, connect valve F1, F2, F3, F4, F5, F6 stir the water sand fluid-mixing of generation silt particle a concentration of 5% in water tank and are transported to three-phase mixer 9, start three-phase Three-phase injection pump in mixer 9, by the three-phase filling line 8 in air-water-sand transport to pit shaft；

(8) mixture for flowing through three-phase filling line 8 passes through the effect of radial flow current divider 4, conversion flow direction and flow pattern, becomes For radial flow, into analogue perforation eyelet 19, gravel packing zone 17, mechanical screen casing 18, the reservoir sand being blocked then is deposited in diameter The annular space formed to stream current divider 4 with analog casing 2；When air-water-silt particle mixture flow into inside mechanical picker pipe 18 with Afterwards, by the effect of gas separator 7, gas on the annular space that is formed by analog casing 2 and simulated production oil pipe 3 by returning cocurrent Enter gas cylinder group 6 to recycle, water-silt particle mixture then by the castering action of the lifting tubing string inside production tube 3, flows back into Water tank 10 simultaneously carries out separation of solid and liquid；

(9) during step (7), (8), record the return data of pinpoint pressure meter P1, P2, P3, P4 in real time, according to P1, The difference of P2 change with time rule evaluation gravel filling bottom position, due to gravel fill caused by add epidermis system Number, the anti-accumulation for pushing away gravel filling bottom position reservoir sand in gravel layer, laws for plugging；According to the difference of P3, P4 at any time Between changing rule evaluation gravel filling top position at, add skin factor caused by being filled due to gravel, the anti-gravel that pushes away fills Fill out accumulation in gravel layer of reservoir sand at top position, laws for plugging.Comparative study hydrate recovery well gravel packing operations The position or generation wriggling destruction at first blocked at first leads to the position of sand control failure；

(10) during step (7)~(9), the silt concertation in water-silt particle mixture that observation passes through valve F3 in real time And sand grains grain size, if the silt particle concentration of mixed injection is not much different in silt concertation and water tank in production fluid, in production fluid The grain size that shakes out it is consistent with the reservoir sand particle diameter distribution of mixed injection in water tank, then illustrate that current gravel filling process parameter is uncomfortable Reservoir should be exploited in current hydrate, need suitably to reduce the size of filling layer gravel, using the quartz sand of -100 mesh of 70 mesh, return Return step (3)；Conversely, then illustrate that gravel filling process parameter designing is too conservative, and if pinpoint pressure meter under this condition Pressure difference rising is too fast, illustrates that Gravel packing is too small or filling thickness is excessive, although being conducive to sand control ought both be unfavorable for maintaining hydration Object exploits well capacity, then needs to be adjusted to the quartz sand of -50 mesh of 30 mesh, return to step (3).

In order to facilitate understanding, it should be noted that：

Described above evaluates stratum silt particle in pack gravel layer based on pinpoint pressure meter reading difference inside and outside filling layer Accumulation, block process, fundamental surveillance principle is：With accumulation of the fine grained silt particle in gravel layer, gravel is caused to fill Layer permeability continuously decreases, and the reaction that reduces of permeability is that the pressure difference inside and outside pack gravel layer can gradually become in measurement data Greatly.Under same formation outlet, water yielding condition, the rising of gravel layer inside and outside differential pressure is faster, and it is easier to show that gravel layer generation blocks, Vice versa.If there is two groups and the different parallel test of more than gravel filling process parameter are compared, then it can pass through gravel The time or the speed of inside and outside differential pressure climbing speed that stone filling layer blocks preferably go out preferably gravel filling process parameter.

Specific evaluation parameter using the situation evaluation gravel filling effect that shakes out in well head production fluid is containing in production fluid Sand grains diameter in sand concentration, production fluid evaluates the basic principle of gravel layer filling effect by situation of shaking out in well head production fluid It is：If gravel layer filling process parameter is mismatched with reservoir sand parameter, filling layer may be caused not have sand block effect, this Shi Huiyou largely injects reservoir sand output, is shown as in well head production fluid：In silt concertation and water tank in production fluid The silt particle concentration of mixed injection is not much different, shake out grain size and the reservoir sand particle diameter distribution of mixed injection in water tank in production fluid Unanimously；, whereas if gravel filling process parameter designing is too conservative, then in well head production fluid silt concertation is minimum or production fluid in Reservoir sand grain size very little, although being conducive to sand control in this case, be unfavorable for the maintenance of stratum production capacity, need to combine at this time Pinpoint pressure meter difference considers production capacity situation and carrys out preferably best gravel filling process parameter.

The implementation of above-mentioned gravel filling effect monitoring method through this embodiment, most basic purpose are：Produce well head The silt particle concentration and particle diameter distribution gone out in liquid is in controllable section, appropriate to stop stratum silt particle, maintains the normal production on stratum, i.e., Reach the sand management effect of " anti-row combines, based on row ".And it can verify that the final of different gravel pack service parameters Cased hole gravel packing quality optimizes best filling construction parameter combination；Optimize gravel filling process parameter, preferably most preferably fill gravel The technological parameters such as rock layers size, thickness；Shale flour sand hydrate reservoir output object is evaluated under long-term mining conditions in gravel It accumulates, penetrate process；Hydrate recovery well is fitted in the lower cased hole gravel packing of simulating hydrate reservoir fracture pressure condition limitation Ying Xing；It verifies that the adaptation of certain gravel filling process parameter is shaked out concentration range, the control of scheme is depressured for hydrate recovery well System provides foundation.

By above-mentioned steps, best gravel pack service parameter and the technological design of hydrate recovery well can be preferably obtained Parameter exploits sand control completion design for China's Gas Hydrate In Sea Areas and provides foundation.But it must be noted that above-mentioned implementation case Technological parameter, the filling parameters being designed into example are not practice of construction data, not because data above enumerates limitation originally yet The protection domain of patent, data above are for only for ease of analysis of cases description, are not to make other forms to the utility model Limitation, any person skilled in the art is changed or is modified as possibly also with the technology contents of the disclosure above equivalent The equivalent embodiment of variation is applied to other fields, but every without departing from the content of the technical scheme of the utility model, according to this reality Any simple modification, equivalent variations and the remodeling made with novel technical spirit to above example, it is new to still fall within this practicality The protection domain of type technical solution.

Claims (7)

1. hydrate recovery well cased hole gravel packing analogue system, which is characterized in that with live practice of construction tool be 1:1 corresponds to Relationship, including test well subsystem, simulation filling subsystem and filling quality detection subsystem；

The test well subsystem includes simulation wellbore hole, analog casing, simulation oil pipe, three-phase injection pipeline and mechanical screen casing, mould Intend being provided with blowout preventer flashboard at the well head of pit shaft；Three-phase filling line interface, gas output are installed on blowout preventer flashboard Pipe interface, water sand output/filling line interface and slurry return out pipe interface, and are mounted at each pipe interface corresponding Gate valve；Analog casing is arranged in simulation wellbore hole, and the annular space between simulation wellbore hole and analog casing is additionally provided with oil pipe and passes through envelope Every device, and three-phase injection pipeline passes through the oil pipe to pass through packer and the radial flow shunting for being fixed at simulation wellbore hole bottom Device is connected；Simulation oil pipe and mechanical screen casing are arranged in analog casing, and simulation oil pipe is connected with mechanical screen casing and positioned at mechanical picker The top of pipe；And analogue perforation eyelet is preset with according to real well bottom perforating parameter in the pay interval of analog casing, simulation is penetrated Hole eyelet segment length is consistent with mechanical picker length of tube；Annular space between analog casing and simulation oil pipe is also equipped with oil jacket annular space envelope Every device, oil jacket annular packer is located at the top of analogue perforation eyelet；The outer protective cover of mechanical screen casing and analog casing inner wall, oil The space formed between set annular packer and shaft bottom is gravel pack space in pipe；

The simulation filling subsystem includes the height of the filling pipe string combination being arranged in simulation wellbore hole and setting on the ground Air bottle group, water tank, gravel mulling case, three-phase mixer and slurry recycling can, filling pipe string combination include filling piping, filling Packer and filling nozzle, filling piping are arranged in simulation oil pipe, and filling nozzle is arranged on the lower end of filling piping, filling envelope It is mounted between the filling top of nozzle and mechanical picker inside pipe wall every device；Gravel mulling case includes mixing agitator and injection pump, It is connected with water sand output/filling line interface；The arrival end of the gas cylinder group passes through pipeline and oil jacket annular space gas output Circuit is connected, and the port of export of gas cylinder group is connected by pipeline with the arrival end of three-phase mixer, the oil jacket annular space gas Analog casing is in output circuit and simulates the annular space formed between oil pipe；The arrival end of the water tank passes through pipeline and simulation oil pipe Interior lifting tubing string is connected, and the port of export of water tank is connected by pipeline with the arrival end of three-phase mixer；Three-phase mixer includes Air-water-silt particle mixing agitator and three-phase injection pump, the port of export of three-phase mixer pass through pipeline and three-phase filling line interface It is connected；The slurry recycling can returns out annular space with sand-carrying production liquid by pipeline and connect, and the sand-carrying production liquid returns out annular space and is Annular space between filling piping and simulation oil pipe, the interior setting load fluid filter device of slurry recycling can；

The filling quality detection subsystem includes gas separator, lifting tubing string and pinpoint pressure meter and acoustic imaging well logging System；Gas separator only uses in gravel filling effect emulates monitoring process, and gas separator and lifting tubing string are respectively provided with In simulation oil pipe, and the outlet of gas separator and oil jacket annular space gas output circuit communication；The pinpoint pressure meter includes It is managed mounted on the pinpoint pressure meter P3 and P2 of mechanical picker inside pipe wall upper/lower terminal and mounted on the filling position of analog casing Pinpoint pressure the meter P4 and P1 of outer upper/lower terminal；The filling quality detection subsystem is acoustic imaging well logging system under conventional well System.

2. hydrate recovery well cased hole gravel packing analogue system according to claim 1, which is characterized in that the radial direction It flows and is provided with impeller guide piece at the interior inlet of current divider.

3. hydrate recovery well cased hole gravel packing analogue system according to claim 2, which is characterized in that the eddy flow The annular porous plate of lower end linking of flow deflector, annular porous plate are located between radial direction current divider inner and outer wall.

4. hydrate recovery well cased hole gravel packing analogue system according to claim 3, which is characterized in that radially shunt Wedged hole is provided on device inner wall.

5. according to claim 1-4 any one of them hydrate recovery well cased hole gravel packing analogue systems, which is characterized in that The simulation wellbore hole meets full-scale gravel pack tools tripping in and gas hydrates depth of reservoirs condition, depth 200m.

6. hydrate recovery well cased hole gravel packing analogue system according to claim 5, which is characterized in that the slurry Setting load fluid filter device in recycling can.

7. hydrate recovery well cased hole gravel packing analogue system according to claim 6, which is characterized in that the well head Blowout prevention flashboard pressure resistance 15Mpa.